Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b92979a4f48f45…

MALICIOUS

PDF

33.1 KB Created: 2020-08-22 09:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecace03fd206b65c002922c0baeea23f SHA-1: 82cf79528ad3414d2b234cf28ed32e667087ff99 SHA-256: 80b92979a4f48f4505f51df7719e63c587a538ea36500c5d91080f4c04cb5f90
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL found in the heuristics. This suggests the primary purpose is to redirect the user to malicious infrastructure, likely for phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=gana+balachander+song++mp4
    • http://files.loveforlocals.com/uploads/1/3/2/3/132303351/dosag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0450/3647/0430/files/robot_modeling_and_control_spong_2006.pdf
    • https://cdn.shopify.com/s/files/1/0433/1349/6222/files/mozevubegaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5109/8007/files/walogigibalaji.pdf
    • https://cdn.shopify.com/s/files/1/0430/5692/2778/files/96436911171.pdf
    • https://cdn.shopify.com/s/files/1/0437/2240/8087/files/canciones_guitarra_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/9952/9120/files/37105936303.pdf
    • https://cdn.shopify.com/s/files/1/0444/3154/0391/files/cancer_de_piel_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0435/3831/7471/files/kapovopujepubog.pdf
    • https://cdn.shopify.com/s/files/1/0437/8741/9806/files/98267828729.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7568/files/c_value_paradox_short_note.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000041f3.bin
b39052b697529cbf48f88d1cc63eb2cb1b0794a80a82a52a0e3d4737c4664159
pdf-font-stream PDF embedded font (sfnt) at offset 0x41F3 5748 bytes
font_01_sfnt_off00005555.bin
3a52139ad3cce0dfbd03b15e21462386e58fc09ade9ae06da2f1304bb372475a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5555 10276 bytes